Arsenic

Arsenic

• Who discovered Arsenic?

1. Arsenic was discovered by Albertus Magnus.

• When was it discovered?

1. It was discovered in 1250.

• Symbolm, Atomic Number and Atom Mass.

1. symbol: As.

2. Atomic number: 33

3. Atomic Mass: 74.9216amu (atomic mass number).

• Number of protons neutrons and electorn.

1. Protons: 33.

2. Neutrons: 42.

3. Elecrtons: 33.

• Where it is found( air, water, and land) and in what shape.

1. Arsenic is foundin the natural environment in some abundance in the Earth's crust in small quantities in rock, soil, water and air.

• Physical facts:

1. Melting point 817.0°C (1090.15Km 1502.6°F)

2. Boiling point 613.0°C(886.15K, 1135.4°F)

3. Density @ 293 K: 5.72 g/cm3

4. Abundance in the Earths curst (cryst includes air, water, land)

• Use (how element is used).

1. Up to 2% of Arsenic is used in lead alloys for lead shorts and bullets.

2. Aresenic is also used for taxonomic sample preservation.

3. Is also used in optical glass.

• Fact

1. Arsenic is a poisonous substance, which is released both from certain human activities and naturally from the Earth's crust.

• Sources

1. Sources of arsenic include: contaminated foods (especially seafood), water or medications. Industrial sources are: ore smelting/refining/processing plants, galvanizing, etching and plating processes.

2. Tailings form or river bottoms near gold mining areas (past or present) may contain arsenic.

3. Insecticides and fungicides (Na-, K- arsenates, arsenates, also oxides are aommerically available).

4. Commercial arsenic produsts include: sodium arsenate, calcium arsenate, lead arsenate and "Paris green" (cupric acetoarsenite) a wood preservative.

   
   
   
   
   

   http://www.webelements.com/ arsenic/